FEM calculation of residual stress after pulsed current ARC welding of aluminium alloy

• Autorzy: Skibicki A.
• Języki publikacji: EN

Abstrakty

EN

Construction made of aluminium alloy is lighter than of steel. The use of pulsed arc for welding is helpful, but has influence on structure and residual stresses after welding. FEM model of the welded plate made of aluminium alloy was used here. The 2D model, lying on the surface of welded sheets, was used. Because of the models symmetry only ˝ of the surface was calculated. The calculations were done with ANSYS in two phases, as uncoupled thermal and mechanical calculations. The iterative calculations of deformations and stresses are non-linear with temperature dependent material properties. The mesh of 1337 finite thermal elements SHELL57 was used. Simulation has 10,3 s of welding time followed by cooling until 800 s. Different type of pulse was used. One single period of current pulse was all the time 0,5 s. This time was divided into 5 equal sub-periods. The heat source (current of welding) was switched on for some sub-periods. The power of heat source was multiplied by factor 1,2 or 3. Distributed volume heat source was moving along of weld line. Results from temperature analysis were used in stress calculation. Elements type and material properties were changed to structural PLANE42. The results show that some residual stresses after pulsed arc welding were higher as after constant. The maximums of tensile stresses were concentrated at small, perpetual areas. They are too small for experimental measuring, but together significantly sufficient for crack propagation or local stress corrosion.

Słowa kluczowe

EN

welding; stress; FEM; aluminum; pulsed arc

• Wydawca: Faculty of Ocean Engineering and Ship Technology, Gdańsk University of Technology
• Czasopismo: Journal of Polish CIMAC
• Rocznik: 2012
• Tom: Vol. 7, no 3
• Strony: 269--274
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Skibicki A.

• University of Technology and Life Sciences in Bydgoszcz, Faculty of Mechanical Engineering Prof. S. Kaliskiego 7, 85-796 Bydgoszcz,

Bibliografia

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• [6] Skibicki A., Identyfikacja stanu termicznych i mechanicznych skutków procesu spawania wybranych elementów z uwzględnieniem metod numerycznych, Doctor’s thesis. ATR Bydgoszcz. Wydział Mechaniczny 1998.
• [7] Skibicki A., Numeryczna ocena wpływu pulsacji łuku na naprężenia pospawalnicze w stopach aluminium. Materiały i Technologie. Roczniki Naukowe PTM. Nr 3 (3), str. 213 ; 216. 2005
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